As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF GOT CABIN DUCT OVHT CAS AND SHORTLY AFTER THAT SMOKE IN THE BACK WAS NOTED. REMOVED AND REPLACED CABIN TEMP CONTROL VALVE IAW LEARJET 45 AMM 21-60-04 UP TO STEP NO. 9 . REMAINING STEPS C/W OPS / LEAK CHECK GOOD. RAN TEMP SYSTEM FULL HOT AUTO FOR 20 MIN WITH NO DEFECTS NOTED.